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DRIVING CHAIN GEAR FOR RETARDING THE TRANSPORT IN SHEET FEEDERS.

APPLICATION FILE-D .IUNE 4,1915- ;II, 1 94,562 Patented Aug. 15, 1916.

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, DRIVING CHAIN GEAR FOR RETARDING THE TRANSPORT IN SHEET FEEDERS. APPLICATION FILED JUNE 4.1915.

1,194,562.. Patented Aug. 15,1916.

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DRIRTING CHAIN GEAR FOB, RETARDING THE TEANEPORT I1\T SHEET-FEEDERS.

LEM-562..

Specification of Letters Patent.

Application filed June 4;, 1915. Serial No. 32,067.

To all whom it may concern:

Be 1t known that T, Gnome Srmss, a cltizen of the German Empire, and a resident of Leipzig-Reudnitz, Germany, have invented certain new and useful Improvements in Driving Chain Gears for Retarding the Transport in Sheet-Feeders, of which the following is a specification.

This invention has reference to improvements in driving chain-gears for retarding the transport of sheets of paper in sheet feeders.

It is known to be old to impart a retarded motion to the devices for advancing sheets of paper in sheet feeders by means of chaingears attached to the driving mechanismof the sheet advancing devices. The driving chain-wheel of such chain-gear is eccentrically mounted upon the driving gear so that its pitch circle approximately passes through the axis of the shaft of the driving wheel. By this arrangement the tension of the chain changes continuously.

According to the present invention allowance for these changes is made by mounting one of the chain-wheels around which the chain passes upon an arm which is subject to compulsory displacement.

In order to render the invention entirely clear, reference is had to the accompanying drawing in which Figure 1, represents in elevation the arrangement of the devices in one end position. Fig. 2, is a similar view illustrating the devices in another end position. Fig. 3, is a plan view of the device. Fig. 4c shows a modification in one end position. Fig. 5, illustrates this modification in another end position. Fig. 6, is a side elevation of the device shown in Figs. 4, and 5. Fig. 7, is a detail view on an enlarged scale.

Similar characters of reference denote like parts in all the figures.

In the drawing, in Figs. 1, 2 and 3 the driving sprocket-wheel E is eccentrically mounted upon the driving gear H so that its pitch circle approximately passes through the axis of the shaft I of the driving gear H. The chain G passes from the driving sprocket E over the sprocket-wheel F, the guiding roller It and the sprocket-wheels S and T.

According to the present invention the sprocket-wheels S and T are mounted upon a swing arm U in such a manner that the sprocket-wheel S is mounted upon the free end of the arm U while the sprocket-wheel T s mounted upon the shaft V of the said swing arm. A toothed wheel W is also mounted upon the shaft V which engages a toothed rack X.

The position of the swing arm U is so selected that at the largest maximum distance apart of the shafts of the sprocketwheels E and F the said swing arm occupies its initial position as shown in Fig. 1. lVhen the chain moves the sprocket-wheel T rotates and accordingly the toothed wheel W which is mounted upon the said shaft V of the sprocket-wheel T. The toothed rack X thereby has a motion in an upward direction and the swing arm U gradually reaches its second end position, as shown in Fig. 2. This is attained by means of the driving gear H for the chain device. The driving gear H is mounted upon the shaft J and an eccentric disk Z is mounted upon the same shaft. A roller Y rests upon the circumferential edge of the eccentric disk Z. This roller Y is mounted upon an arm 13 formed on the toothed rack X and said arm B has a slot C permitting the arm to move up and down. Assuming'that the shaft J rotates then the eccentric disk Z will force the arm B by means of the roller Y into itsi second or upper end position. The toothed rack X, being integral with the arm B, therefore will move in an upward direction thereby engaging the gear W upon the shaft V of the swing arm U. Thus the swing arm U is moved from the initial or upper end posi tion into the second or lower end position as shown in Fig. 2; that is from the position shown in Fig. 1 into the position shown in Fig. 2. By means of the described arrangement the operator is enabled to retain always a uniform tension of the chain. This the operator effects by proper selection of the transmission of the toothed-wheels. This uniform tension of the chain is'independent ofthe distance apart of the shafts of the two sprocket-wheels E and F.

In the modified form illustrated in Figs. 4 to 7 the compulsory movement of the sprocket-wheel S is also effected from the sprocket-wheel E but by means of a crank mechanism. The sprocket-wheel E is formed so as to act as a. crank disk which by means of the crank rod U acts on the bear ing of the sprocket-wheel S that moves in the straight guiding rails Y. The chain G which passes over the sprocket-wheels E Patented An 15, rare.

and F also passes over the guiding sprocketwheel F and the sprocket-wheel S Corresponding to the position of the sprocketwheel E relative to the sprocket-wheel F the sprocket-wheel S moves in the straight guide Y by means of the crank mechanism.

For the purpose of equalizing the uneven motion which is inherent to every crank mechanism the crank rod U may be spring operated, as shown in Fig. 7 In this instance the crank rod is made in two parts of which the part U is hollow while the second part U moves therein. Between these two parts a. spring Z is inserted whereby the crank rod may be shortened or lengthened during its motion.

.1 claim as my invention:

1. A driving chain gear for retarding the transport. in sheet feeders comprising a driving sprocket-wheel, a set of sprockets, a chain passing over all the sprockets, and a longitudinal. member subject to a compulsory displacement, one of said sprockets being mounted on said longitudinal member.

2. A driving chain gear for retarding the transport in sheet feeders comprising a driving sprocket-wheel, a set of sprockets, a chain passing over all the sprockets, and a longitudinal member subject to a compulsory displacement and performing a swinging motion, one of said sprockets being mounted on said longitudinal member.

8. A driving chain gear for retarding the transport in sheet feeders comprising a driving sprocket-wheel, a set of sprockets, a chain. passing over all the sprockets, and a longitudinal swinging member, subject to a compulsory displacement, one of said sprockets being mounted on said longitudinal member.

4. A driving chain gear for retarding the transport in sheet feeders comprising a driving sprocket wheel, a set of sprockets, a chain running over the sprockets, a longitudinal swinging member receiving its motion from the driving sprocket and adapted to displace one of said sprockets to effect a uniform tension of the chain.

5. A driving chain gear for retarding the transport in sheet feeders comprising a driving sprocket-wheel, a set of sprockets, a chain passing over the sprockets, a longitudinal swinging member receiving its motion from the driving sprocket, one of said sprockets being mounted upon the longitudinal member, and a toothed wheel, and a toothed rack, both sub1ect to compulsory displacement whereby the chain is tensioncd.

Signed at Leipzig Germany, this f day of May 1915.

GEORG SPIESS.

Witnesses:

RUDOLPH FRICK'E, ERNA SCHMIDT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

